1. Approximation by positive operators

   • Tsuyoshi Ando
   • Takashi Sekiguchi
   • Teruo Suzuki

   OriginalPaper Pages: 273 - 282

2. Quadratic forms and theu-invariant. I

   • Richard Elman
   • Tsit-Yuen Lam

   OriginalPaper Pages: 283 - 304

3. Nilpotent fixed point free automorphism groups of solvable groups

   • Thomas R. Berger

   OriginalPaper Pages: 305 - 312

4. Über die Erzeugung von Faltungshalbgruppen auf beliebigen lokalkompakten Gruppen

   • Eberhard Siebert

   OriginalPaper Pages: 313 - 333

5. Correction to “a class of rank three affine planes”

   • Michael J. Kallaher

   OriginalPaper Pages: 335 - 337

6. A convergence theorem for selfadjoint operators applicable to Dirac operators with cutoff potentials

   • Rainer Wüst

   OriginalPaper Pages: 339 - 349

7. A spectral gap theorem for Dirac operators with central field

   • Upke-Walther Schmincke

   OriginalPaper Pages: 351 - 356

8. The non-simplicity of certain categories of topological spaces

   • Darrell W. Hajek
   • Richard G. Wilson

   OriginalPaper Pages: 357 - 359

9. Schrödinger operators with singular magnetic vector potentials

   • Barry Simon

   OriginalPaper Pages: 361 - 370